The Geology and Thermochronology of Cretaceous Magmatism of Southeastern Vietnam.
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| Title: | The Geology and Thermochronology of Cretaceous Magmatism of Southeastern Vietnam. |
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| Authors: | Vladimirov, A. G.1,2,3 (AUTHOR) vladimir@igm.nsc.ru, Phan, L. A.4 (AUTHOR) luuanh-phan@yahoo.com, Travin, A. V.1,2,3 (AUTHOR), Mikheev, E. I.1,2 (AUTHOR), Murzintsev, N. G.2 (AUTHOR), Annikova, I. Yu.1,2,3 (AUTHOR) |
| Source: | Russian Journal of Pacific Geology. Jul2020, Vol. 14 Issue 4, p305-325. 21p. |
| Subject Terms: | *Geology, *Magmatism, *Plate tectonics, *Andesite, *Breccia |
| Geographic Terms: | Vietnam |
| Abstract: | Geological, mineralogical–petrographic, and geochronological studies (U/Pb, Rb/Sr, and Ar/Ar isotope dating) of igneous complexes of the Dalat Zone identified two stages, which reflect a change in the geodynamic regime. The first, Late Jurassic, stage corresponded to a suprasubduction setting with formation of volcanic sequences of the Deobaoloc complex: calc-alkali basaltic andesites, andesites, dacites, their tuff breccias, and tuffs. The second, Albian–Coniacian, stage of the transform setting was related to a sliding zone of tectonic plates, activation of general left-lateral shear deformations at the continent–ocean boundary, and formation of paleovolcanic structures and related Dinhquan granitic batholiths (113 ± 0.6 Ma), Ancroet granites (97 ± 0.4 Ma), Deoca monzogranodiorites (90.4 ± 0.3 Ma), and Cana leucogranite–alaskites (86.8 ± 1.5 Ma). The thermochronological analysis and mathematical modeling indicate that the live period of parental granitic magma in a transform geodynamic setting was Δt of ~27 Ma and differentiation in the deep source resulted in origination of the final Cana leucogranite-alaskitic intrusive stocks with Au–Mo ± Cu mineralization. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Abstract: | Geological, mineralogical–petrographic, and geochronological studies (U/Pb, Rb/Sr, and Ar/Ar isotope dating) of igneous complexes of the Dalat Zone identified two stages, which reflect a change in the geodynamic regime. The first, Late Jurassic, stage corresponded to a suprasubduction setting with formation of volcanic sequences of the Deobaoloc complex: calc-alkali basaltic andesites, andesites, dacites, their tuff breccias, and tuffs. The second, Albian–Coniacian, stage of the transform setting was related to a sliding zone of tectonic plates, activation of general left-lateral shear deformations at the continent–ocean boundary, and formation of paleovolcanic structures and related Dinhquan granitic batholiths (113 ± 0.6 Ma), Ancroet granites (97 ± 0.4 Ma), Deoca monzogranodiorites (90.4 ± 0.3 Ma), and Cana leucogranite–alaskites (86.8 ± 1.5 Ma). The thermochronological analysis and mathematical modeling indicate that the live period of parental granitic magma in a transform geodynamic setting was Δt of ~27 Ma and differentiation in the deep source resulted in origination of the final Cana leucogranite-alaskitic intrusive stocks with Au–Mo ± Cu mineralization. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 18197140 |
| DOI: | 10.1134/S1819714020040065 |
